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    <title>案例一</title>
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    <h1>首页</h1>
    <h2>导航栏</h2>
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    <pre>
	
		<a href="https://www.csdn.net/">csdn</a>
	
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    <title>Document</title>
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        <ul >
            <p>今日饮品清单</p>
            <li type = "disc">咖啡</li>
            <li type = "disc">茶</li>
                <ul>
                    <li type = "circle">黑茶</li>
                    <li type = "circle">绿茶</li>
                    <ul>
                        <li type = "square">国产</li>
                        <li type = "square">非洲产</li>
                    </ul>
                </ul>
            <li type = "disc">牛奶</li>
        </ul>

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